Fig. 5: Longitudinal profile of antibodies against the spike protein in hematological patients receiving prior or ongoing rituximab treatment.

Spike antibody (S-Ab) levels were determined at 1, 3, and 6 months after nasal swabs became PCR-negative in hematological patients receiving prior (a) or ongoing rituximab treatment (b). The cutoff value for determining seropositivity for S-Ab is shown by the dotted lines.